Generic, reduced state, maximum likelihood decoder
AssigneeHarris Corporation
InventorsJames A. Norris, John W. Nieto
Life of this patent
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Abstract
A decoder includes at least one programming input for a plurality of programmable reduced-state trellis parameters. A programmable device is connected to the at least one programming input and implements a reduced-state maximum likelihood decoder that is operable for processing a continuous phase modulated (CPM) signal and returning up to N bits that were transmitted based on a maximum likelihood and current winning super-state and corresponding survivor full-state. The programmable device calculates the path metrics for every super-state and determines a best path based on the reduced-state trellis parameters.
Claims25
A decoder comprising:
- at least one programming input for a plurality of programmable reduced-state trellis parameters;
- and
- a programmable device connected to the at least one programming input and implementing a reduced-state maximum likelihood decoder that is operable for processing a continuous phase modulated (CPM) signal and returning up to N bits that were transmitted based on a maximum likelihood and current winning super-state and corresponding survivor full-state, wherein said programmable device calculates the path metrics for every super-state and determines a best path based on the reduced-state trellis parameters.
A decoder comprising:
- at least one programming input for a plurality of programmable reduced-state trellis parameters;
- and
- a programmable device connected to the at least one programming input and implementing a reduced-state maximum likelihood decoder that is operable for processing a continuous-phase modulated (CPM) signal and returning N bits that were transmitted based on a maximum likelihood and current winning super-state and corresponding survivor full-state, wherein said programmable device calculates the path metrics for every super state and determines a best path based on a forward state trellis when a winning full-state is received and full-states are combined into a super-state based on the reduced-state trellis parameters.
A method of implementing a decoder comprising:
- inputting a plurality of programmable reduced-state trellis parameters;
- and
- processing within a programming device a continuous phase modulated (CPM) signal and returning N bits that were transmitted based on a maximum likelihood and current winning reduced-state, calculating the path metrics for every super-state and determining a best path based on the reduced-state trellis parameters.
Dependencies are inferred from the claim text.